Well that last one might not be a rumour since Switch is known for being ignored most of the time, sorry Nintendo.

So you see Red Dead Redemption 2 is not new to speculation. However, in my opinion reports about a release date are different than these other rumours, because they actually give you a date to look forward to, instead of just waiting around without any marks on the calendar.

So now we just have to wait for September. However, even if the game does not come out as speculated, it would come out in either November or December. We would have to be patient for just one or two more months, since its release is confirmed in 2017 by Rockstar games.